Base for a stand



FIG. 1 is a perspective view of the base for a stand embodying the design;

FIG. 2 is a side elevation;

FIG. 3 is a top plan view; and,

FIG. 4 is a bottom plan view.

The broken lines are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a base for a stand, as shown and described. 